Відео

Thank you, that’s very kind! It does sound great, especially with the Celestion Gold in a good cabinet.

Hi! I think the easiest mod of these would be the bright switch: I would try and lower the value of the cap between the lugs of the normal volume. If this isn't enough I'd do another deep dive on Rob Robinette's web page to get answers. :) Regarding the hot switch I vaguely recall having read something about this, probably on Nik Player's page: www.nikplayer.com/2012/01/ac15hw1-modifications.html?m=1 Sorry that I can not be more specific, I wanted to fix the hot switch as well but never got around to it, I'm happy just using the cold mode now.

Thanks, that helps. I've done bright cap changes on volume pots before so that should be easy enough. I'm not sure if I'd rather get the 15HWx combo or the 30HWx/head for some ample clean headroom. I mostly use humbuckers and beefy single coils, so a 250 coupling cap might be a good option for me to try as well. Once I decide on one of the HW amps I can then decide what further mods, if any, I'd like to do.

Hej Bosse! Transformatorn ger all ström som behövs, B+ och 6,3V. Jag har köpt den av ett företag i Litauen, toroid lt, som också lindar efter specifikation, de anpassar transformatorn efter ens behov. Här är en länk till deras sida på Ebay: www.ebay.com/usr/toroid-lt?_trksid=p2047675.m3561.l2559

Iof smidigt att få centertap med från början it från trafon…ch ingen större skillnad prismässigt att ta allt från trafon. Åter igen…ett riktigt coolt bygge!

@@blobbenfinns Tack!

It actually is a Mk II, the 5 volt winding of the power transformer was burned sometime along its history and the tube rectifier replaced with diodes.

No. In a 2203 head the presence control is connected from the output transformer to the phase inverter which are parts my preamp doesn't have. I think this feature is more for power amps.

Thanks Endre! I bought it from this guy www.ebay.com/usr/toroid-lt . He's also made me power transformers for a Vox AC15HW , another for a single ended project and output transformer for that same project. Cheap, custom service and great communication, highly recommended!

@@karlekspsykopat Thanks for the answer. Really consideriing doing the same, but it will be my first "on my own" build. Have built two amps from kits before. Did you just replicate the schematics and sent the signal to an output jack instead of a phase inverter , or did you shape the output signal after the output of the second tube any way?

@@endresletvold5586 I used 2203 schematics mostly from rob robinettes web page and then added a 1M pot before the output jack. It was an easy way to do it and it works.

Thanks Aquila! I haven't tried it straight into my interface because of my setup (all preamps go to the power amp in my Marshall 4203 which runs on full volume then into the attenuator). Having it this way I can AB-test all pres which is the best way I think to make my own builds sound the way I like them. If I should run my own built pre straight into DAW, I would probably include a phase inverter tube in the design. Not necessary as an inverter but pushing this gain stage is a part of the full sound. Regarding fear of blowing your JMP 50, have you tried adjusting the bias a little colder? The Marshalls I have (4203 and a 9100 power amp) were biased very cold from the factory, below 50% of max dissipation. It feels like a waste to be afraid of using a good amp like that. 😊

Thanks! It's a proper rock machine!

It's Chinese. I did replace it with a Celestion Gold so I could use just the speaker with more powerful amps.

@@karlekspsykopat My Ac15 has a UK made and it's not second hand amp y bought new in a shop

Thank you Fran, I will sure check it out. :)

I totally agree! I'm finding gain staging + cap values more and more interesting, you can really have your overdrive taylor made.

@@karlekspsykopat and speaker choice as well, change speaker and find the new happy point with capacitor values

@@karlekspsykopat i would first ask....does the 500 pf have a Jazz chip in it? Oh, and more seriously, when you played the main riff of "Oh Well", did you take your pups out of phase like Peter Green?

I agree and would probably stick with the 100 if I were to only use guitars with humbuckers.

@@karlekspsykopat Perhaps split the difference and do 200, 250 or 300?

@@davidsparks3491 Maybe I will try that when it's time to gig on the other side of covid-19!

Christian, thanks! I agree regarding the 500pf. Had I liked higher gain sounds in this amp I would have perhaps gone with the smaller 100pf or tried something in between, 250pf maybe. Really comes down to fine tuning between guitar of choice and preferred gain level. I’ve never tried the Alnico blue in this, would be interesting!

@@karlekspsykopat i have a blue in my 50th anniversary hand wired, with Top Boost and the EF 86 circuits...spent some cash and put OG unopened Mullards in it......Lord, does it SANG! My tube guy in Colorado is da Boss. He told me if there were any of the unopened tubes that were duds, weak, or microphonic, he would not only replace, but also refund the purchase price...amazing!...but i've had nothing but astounding success with these...gonna need to build a tackle box of extras for each position

Hi Mustafa! No, just guitar straight in to amp. I use the volume of the Top Boost channel to get more or less overdrive (the amp has master volume). If anything hides the result, it is my reverberating kitchen and iphone microphone. I hope you could hear the effects of the different caps anyway. :)

ShamelessMan, thanks! I will try that.

Thanks a bunch! I know you know it brother!